Silverlight 4常用StringFormat格式总结
本文共 6754 字，大约阅读时间需要 22 分钟。
在Silverlight项目中，经常会根据需求的不同，提供不同的字符格式到客户端。这篇文章总结了目前Silverlight 4常用StringFormat绑定字符格式，方便大家在以后的开发中调用参考。
早期的格式转换方法
在Silverlight 4之前的版本，通常修改字符格式是通过实现IValueConverter接口，在IValueConverter接口中包含有两个方法：
1. Convert， 在绑定源数据传送到客户端显示前，转换修改数据；
2. ConvertBack，在目标数据传送到绑定源数据前，转换修改数据，该方法仅被用于“TwoWay”绑定模式；
例如，根据布尔型判断实现控件是否显示在客户端，下面是一个简单的转换代码，通过实现IValueConverter，判断控件Visibility属性值。
1 public class VisibilityConverter : IValueConverter
2
3 {
4
5 public object Convert(object value,Type targetType,object parameter,CultureInfo culture)
6
7 {
8
9 bool visibility = (bool)value;
10
11 return visibility ? Visibility.Visible : Visibility.Collapsed;
12
13 }
14
15 public object ConvertBack(object value,Type targetType,object parameter,CultureInfo culture)
16
17 {
18
19 Visibility visibility = (Visibility)value;
20
21 return (visibility == Visibility.Visible);
22
23 }
24
25 }
Silverlight 4的StringFormat属性
在Silverlight 4中，数据绑定SDK提供一个“StringFormat”的属性，该属性允许开发人员自由定义输出字符格式，例如，DataPicker控件，该控件提供SelectedDateFormat属性，控制其输出格式“短格式”或“长格式”。
SelectedDateFormat="Short", “默认”
SelectedDateFormat="Long"
而如果需要输出“April 01, 2011”格式，则无法使用SelectedDateFormat控制其格式，这时可以使用StringFormat属性完成需求。
<toolkit:DatePicker SelectedDate="{Binding DemoDate,Mode=TwoWay, StringFormat='MMM d, yyyy'}" />
再例如，早期实现一段文字绑定信息需要按照以下格式操作：
<TextBlock Text=”当前登录用户: ”/>
<TextBlock Text=“{Binding Name}”/>
输出: 当前登录用户Jv9
在Silverlight 4中使用StringFormat属性，可以简单的实现如下:
<TextBlock Text=“{Binding Name, StringFormat=’当前登录用户: \{0\}’}”>
这样实现简单而又方便。
对于StringFormat属性的使用方法还有很多，下面使用实例演示常用的属性：
1 < Grid x:Name ="LayoutRoot" >
2 < ScrollViewer x:Name ="PageScrollViewer" Style ="{StaticResource PageScrollViewerStyle}" >
3 < StackPanel Orientation ="Horizontal" >
4 < StackPanel x:Name ="ContentStackPanel" >
5 < TextBlock FontSize ="16" TextWrapping ="Wrap" Text ="StringFormat和字符串格式" Margin ="8" />
6 < Border BorderBrush ="LightGray" BorderThickness ="1" Width ="300" Margin ="5" HorizontalAlignment ="Left" >
7 < StackPanel Orientation ="Vertical" Margin ="5" >
8 < TextBox x:Name ="txtSource" Width ="125" HorizontalAlignment ="Left" />
9 < TextBlock TextWrapping ="Wrap" Text ="StringFormat='正在输入 "\{0\}"." FontWeight ="Bold" Margin ="0,4,0,2" />
10 < TextBlock Text ="{Binding Text, ElementName=txtSource, StringFormat='正在输入 "\{0\}".'}" TextWrapping ="Wrap" Margin ="0,0,0,4" />
11 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=\{0\,20\}" FontWeight ="Bold" Margin ="0,4,0,2" />
12 < TextBlock Text ="{Binding Text, ElementName=txtSource, StringFormat=\{0\,20\}}" TextWrapping ="Wrap" Margin ="0,0,0,4" />
13 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=\{0\,-20\}" FontWeight ="Bold" Margin ="0,4,0,2" />
14 < TextBlock Text ="{Binding Text, ElementName=txtSource, StringFormat=\{0\,-20\}}" TextWrapping ="Wrap" Margin ="0,0,0,4" />
15 </ StackPanel >
16 </ Border >
17
18 < StackPanel x:Name ="DatePanel" >
19 < TextBlock Text ="StringFormat和日期格式" Margin ="8" FontSize ="16" />
20 < Border BorderBrush ="LightGray" BorderThickness ="1" Width ="300" Margin ="5" HorizontalAlignment ="Left" >
21 < StackPanel DataContext ="{StaticResource SampleDate}" >
22 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=f" FontWeight ="Bold" Margin ="0,4,0,2" />
23 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=f}" Margin ="8,0" />
24 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=F" FontWeight ="Bold" Margin ="0,4,0,2" />
25 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=F}" Margin ="8,0" />
26 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=g" FontWeight ="Bold" Margin ="0,4,0,2" />
27 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=g}" Margin ="8,0" />
28 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=G" FontWeight ="Bold" Margin ="0,4,0,2" />
29 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=G}" Margin ="8,0" />
30 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=m" FontWeight ="Bold" Margin ="0,4,0,2" />
31 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=m}" Margin ="8,0" />
32 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=y" FontWeight ="Bold" Margin ="0,4,0,2" />
33 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=y}" Margin ="8,0" />
34 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=t" FontWeight ="Bold" Margin ="0,4,0,2" />
35 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=t}" Margin ="8,0" />
36 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=T" FontWeight ="Bold" Margin ="0,4,0,2" />
37 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=T}" Margin ="8,0" />
38 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=u" FontWeight ="Bold" Margin ="0,4,0,2" />
39 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=u}" Margin ="8,0" />
40 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=o" FontWeight ="Bold" Margin ="0,4,0,2" />
41 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=o}" Margin ="8,0" />
42 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=MM/dd/yy" FontWeight ="Bold" Margin ="0,4,0,2" />
43 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=MM/dd/yy}" Margin ="8,0" />
44 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=MMMM dd\, yyyy g" FontWeight ="Bold" Margin ="0,4,0,2" />
45 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=MMMM dd\, yyyy g}" Margin ="8,0" />
46 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=hh:mm:ss.fff tt" FontWeight ="Bold" Margin ="0,4,0,2" />
47 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=hh:mm:ss.fff tt}" Margin ="8,0" />
48 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=\{0:r\}" FontWeight ="Bold" Margin ="0,4,0,2" />
49 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=\{0:r\}}" Margin ="8,0" />
50 < TextBlock TextWrapping ="Wrap" Text ="StringFormat='MMM d, yyyy'" FontWeight ="Bold" Margin ="0,4,0,2" />
51 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat='MMM d, yyyy'}" Margin ="8,0" />
52 </ StackPanel >
53 </ Border >
54 </ StackPanel >
55 </ StackPanel >
由于51cto博文字数限制这里只能贴出部分源代码，更多代码请下载源代码。
2 < ScrollViewer x:Name ="PageScrollViewer" Style ="{StaticResource PageScrollViewerStyle}" >
3 < StackPanel Orientation ="Horizontal" >
4 < StackPanel x:Name ="ContentStackPanel" >
5 < TextBlock FontSize ="16" TextWrapping ="Wrap" Text ="StringFormat和字符串格式" Margin ="8" />
6 < Border BorderBrush ="LightGray" BorderThickness ="1" Width ="300" Margin ="5" HorizontalAlignment ="Left" >
7 < StackPanel Orientation ="Vertical" Margin ="5" >
8 < TextBox x:Name ="txtSource" Width ="125" HorizontalAlignment ="Left" />
9 < TextBlock TextWrapping ="Wrap" Text ="StringFormat='正在输入 "\{0\}"." FontWeight ="Bold" Margin ="0,4,0,2" />
10 < TextBlock Text ="{Binding Text, ElementName=txtSource, StringFormat='正在输入 "\{0\}".'}" TextWrapping ="Wrap" Margin ="0,0,0,4" />
11 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=\{0\,20\}" FontWeight ="Bold" Margin ="0,4,0,2" />
12 < TextBlock Text ="{Binding Text, ElementName=txtSource, StringFormat=\{0\,20\}}" TextWrapping ="Wrap" Margin ="0,0,0,4" />
13 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=\{0\,-20\}" FontWeight ="Bold" Margin ="0,4,0,2" />
14 < TextBlock Text ="{Binding Text, ElementName=txtSource, StringFormat=\{0\,-20\}}" TextWrapping ="Wrap" Margin ="0,0,0,4" />
15 </ StackPanel >
16 </ Border >
17
18 < StackPanel x:Name ="DatePanel" >
19 < TextBlock Text ="StringFormat和日期格式" Margin ="8" FontSize ="16" />
20 < Border BorderBrush ="LightGray" BorderThickness ="1" Width ="300" Margin ="5" HorizontalAlignment ="Left" >
21 < StackPanel DataContext ="{StaticResource SampleDate}" >
22 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=f" FontWeight ="Bold" Margin ="0,4,0,2" />
23 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=f}" Margin ="8,0" />
24 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=F" FontWeight ="Bold" Margin ="0,4,0,2" />
25 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=F}" Margin ="8,0" />
26 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=g" FontWeight ="Bold" Margin ="0,4,0,2" />
27 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=g}" Margin ="8,0" />
28 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=G" FontWeight ="Bold" Margin ="0,4,0,2" />
29 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=G}" Margin ="8,0" />
30 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=m" FontWeight ="Bold" Margin ="0,4,0,2" />
31 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=m}" Margin ="8,0" />
32 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=y" FontWeight ="Bold" Margin ="0,4,0,2" />
33 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=y}" Margin ="8,0" />
34 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=t" FontWeight ="Bold" Margin ="0,4,0,2" />
35 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=t}" Margin ="8,0" />
36 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=T" FontWeight ="Bold" Margin ="0,4,0,2" />
37 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=T}" Margin ="8,0" />
38 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=u" FontWeight ="Bold" Margin ="0,4,0,2" />
39 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=u}" Margin ="8,0" />
40 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=o" FontWeight ="Bold" Margin ="0,4,0,2" />
41 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=o}" Margin ="8,0" />
42 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=MM/dd/yy" FontWeight ="Bold" Margin ="0,4,0,2" />
43 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=MM/dd/yy}" Margin ="8,0" />
44 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=MMMM dd\, yyyy g" FontWeight ="Bold" Margin ="0,4,0,2" />
45 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=MMMM dd\, yyyy g}" Margin ="8,0" />
46 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=hh:mm:ss.fff tt" FontWeight ="Bold" Margin ="0,4,0,2" />
47 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=hh:mm:ss.fff tt}" Margin ="8,0" />
48 < TextBlock TextWrapping ="Wrap" Text ="StringFormat=\{0:r\}" FontWeight ="Bold" Margin ="0,4,0,2" />
49 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat=\{0:r\}}" Margin ="8,0" />
50 < TextBlock TextWrapping ="Wrap" Text ="StringFormat='MMM d, yyyy'" FontWeight ="Bold" Margin ="0,4,0,2" />
51 < TextBlock TextWrapping ="Wrap" Text ="{Binding CurrentDateTime, StringFormat='MMM d, yyyy'}" Margin ="8,0" />
52 </ StackPanel >
53 </ Border >
54 </ StackPanel >
55 </ StackPanel >
由于51cto博文字数限制这里只能贴出部分源代码，更多代码请下载源代码。
欢迎大家加入“专注Silverlight”QQ技术群，欢迎大家加入一起学习讨论Silverlight&WPF&Widnows Phone开发技术。
22308706(一群) 超级群500人
37891947(二群) 超级群500人
100844510(三群) 高级群200人
32679922(四群) 超级群500人
23413513(五群) 高级群200人
32679955(六群) 超级群500人
61267622(七群) 超级群500人
88585140(八群) 超级群500人
128043302(九群 企业应用开发推荐群) 高级群200人
101364438(十群) 超级群500人
68435160(十一群 企业应用开发推荐群)超级群500人
本文转自 51CTO博客，原文链接：http://blog.51cto.com/kevinfan/553644 ，如需转载请自行联系原作者
你可能感兴趣的文章
软件测试，需要所有人的努力
查看>>
IO学习总结一
查看>>
Cenots 7.0编译安装libiconv-1.14时的故障
查看>>
如何一次创建大量用户
查看>>
dmidecode+awk搜集内存容量和插槽对应关系
查看>>
手工安装桌面环境；备忘下。
查看>>
mysql简单性能排查
查看>>
Photoshop制作一只可爱的卡通小鸟
查看>>
IBM HP DELL LENOVO服务器接入交换机网络规划
查看>>
Java程序运行时间计算
查看>>
【Struts 2.x】调用addActionError导致异常
查看>>
Windows Server 2012 云硬盘如何挂载
查看>>
Cacti安装
查看>>
中信国际电讯部署F5解决方案优化LTE漫游服务
查看>>
bind+mysql+dlz
查看>>
网络不给力呀
查看>>
分析php代码报502的错
查看>>
微信企业号引入强大应用合作,开创企业移动办公新的蓝
查看>>
MFC编程小技巧-更新中
查看>>
创建ssl 证书
查看>>